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Yanmar 4BY - Checking Engine Oil Pressure

Yanmar 4BY
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LUBRICATION
BY Service Manual
8-9
Tests and Adjustments
Checking Engine Oil Pressure
Perform an engine oil pressure check if there is any
indication of low oil pressure.
1. Start the engine and allow it to warm to normal
operating temperature.
2. Stop the engine.
Figure 8-2
3. Disconnect wires (Figure 8-2, (1)).
4. Remove the oil pressure sensor
(Figure 8-2, (2)).
Figure 8-3
5. Install special tool OEM No. 11 4 050 with
O-ring (Figure 8-3, (1)) in oil pressure sensor
port.
A WARNING
BURN HAZARD!
Keep your hands and other body parts
away from hot engine surfaces such
as the muffler, exhaust pipe,
turbocharger and engine block during
operation and shortly after you shut
the engine down. These surfaces are
extremely hot while the engine is
operating and could seriously burn
you.
Failure to comply could result in death
or serious injury.
0000015enBY
0003765A
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2
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1
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